细微的兰花种子一般都没有胚乳,仅由未分化的胚和一层薄膜状的种皮组成。兰科植物从受粉后到受精这段期间比较长,一般为数日至三个月,最迟的种类要6～10个月。在兰科植物中,除了那些在开花中形成胚珠的种类外,还有卡特兰属,石斛属等受粉后形成胚珠的种类。后者的园艺品种受粉后子房肥大率高,到果实成熟要历时9～15个月。 Subtle orchid seeds are generally without endosperm, undifferentiated only by the embryo and a thin layer of seed coat composition. Orchid plants from powder to fertilization after this period is relatively long, usually several days to three months, the latest species to 6 to 10 months. In orchid plants, in addition to those in the formation of ovules in the flowering, as well as Cattleya, Dendrobium species such as the formation of ovule after ovule. The horticultural varieties of the latter by powder hilar hypertrophy, to the fruit maturity to last 9 to 15 months.